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Finding the Fourth Proportional to 399,417.48, 551,193.33 and 218,129.47

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Solution

The fourth proportional to 399,417.48, 551,193.33 and 218,129.47 is: 301,017.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,417.48 : 551,193.33 = 218,129.47 : x
  2. Step 2: Convert to fraction form
    399,417.48/551,193.33 = 218,129.47/x
  3. Step 3: Cross multiply
    399,417.48x = 551,193.33 × 218,129.47
  4. Step 4: Simplify right side
    399,417.48x = 120,231,508,940.44
  5. Step 5: Solve for x
    x = 120,231,508,940.44/399,417.48
  6. Step 6: Final answer
    x = 301,017.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.